Shadowfel and Mortal Realm fusing together.

[Schiffer]

In my campaign the shadowfel (shadow realm) and the mortal realm are starting to fuse together, and soon my players will be entering this realm. The mortal realm is still dominant, but the shadowfel is starting to absorb it into its realm, creating a part of the mortal world known as the shadowlands. I have some indeas What are some things i can do to push this setting, and some encounters I can use as well.

-Vampire castle coming up obviously.
-A paladin escorting a necromancer to find justice.
-Undead everywhere
-Pens filled with humans for the undead to breed and feed on.
-Maybe a shadow dragon, although I am using a black dragon tonight and don't want to use to many dragons (They are special when I DM, players know there is going to be a good fight, don't want to lose that idea)
-Demons serving Orcus (Demonlord of undeath for those who don't know)
-Enhanced necromancy spells.
-Any other ideas?

[Dox of the ParaDox twins]

I'd take a look at the shadow plane from DND 3.0 they had some really cool ideas

[johnlocke90]

Maybe the connection is stronger at night. Lots of Shadows around and people are afraid to leave home after dark.

Shadows sneaking in is particularly nasty as they create shadow spawn and could overwhelm a village fairly quickly.

[Tyinyk]

Shadowdancers would probably all be coming out of the woodwork to take advantage of the situation that so clearly benefits them.